The video shows a girl running towards the victim before grabbing her and slapping and punching her in the head.
A crowd of children can be seen in uniform as they surround the schoolgirl and watch as her hair is pulled.
She is then kneed and kicked in the head as cries of “fight back” can be heard.
Two girls aged 13 and 15 who took part in the brutal bullying attack have been handed cautions after their playing field assault was caught on camera.
WALES NEWS SERVICE
Mobile phone video shows the victim receiving blows to the head
The terrifying attack, which was filmed on a mobile phone and appeared on social media websites, took place near a school in Barry, South Wales.
The assault finally ends and the 14-year-old schoolgirl from Ysgol Bro Morgannwg scrambles to her feet and bravely walks away with a friend.
The two teenage girls have been given Youth Conditional Cautions – the highest out-of-court sanction that can be given.
The pair appeared before Barry Youth Panel and will now have to work with the Youth Offending Service for the next three months to address their offending and victim awareness.
WALES NEWS SERVICE
Two teens received cautions as a result of the attack
If they do not comply with the conditions the matter would be sent to court.
Paul Francis, Vale of Glamorgan Sergeant, said: "This process will help to address the behaviour of the girls who committed the assault and also offer further support to the victim, who will be afforded additional protection by the order.
"This is not an easy option for the offenders. The interventions are intensive and will force them to appreciate the gravity of the assault and understand the huge impact it has had on their victim.
“They will be under no illusion that failure to comply with its requirements will have serious consequences. The order also aims to minimise further distress to the victim, who will be spared the experience of court proceedings, which can be difficult for all concerned."
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In a statement to parents, guardians and pupils, Hywel Price, the headmaster of the Welsh-language comprehensive school, hit out at the attack in November.
Mr Price said: "The school is fully aware of the incident and footage, and several members of staff have spent countless hours on collating evidence from various sources, collecting written statements from several pupils and meeting parents.
"Two pupils have received fixed term exclusions whilst the school conducts its investigation in co-operation with the Vale Council and the governing body.
"A final decision will be taken on the matter on the conclusion of the investigation in due course. Please be assured that we are investigating the incident thoroughly."
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